css height:auto height:0 code example
Example 1: css height auto vs 100
<div style="height:50px">
<div id="innerDiv" style="height:auto">
<div id="evenInner" style="height:10px">
</div>
</div>
</div>
Example 2: css height auto vs 100
<div style="height:50px">
<div id="innerDiv" style="height:100%">
</div>
</div>